Came so quick, I only ordered them late on Saturday night. Also, they look in perfect condition, no scratches on the paint or anything.

Just filled them with water, and they're far too light (only about 30kg). So, i'm off down B&Q in a minute to buy some sand, hopefully that will at least double the weight if I make it wet. If not then i'll just strap some plates to the side!

quote:Water and Sand do not combine to form a substance which is heavier than either of the two.

Sorry, I don't quite understand you?

Wet sand is far heavier than dry sand. It might not look like there are gaps between grains of sand, but there are. Water can occupy these gaps, and therefore whilst the volume of the matter remains the same, the mass of it increases considerably.

Howdy,If you fill the jerrycans with concrete, they still might not be heavy enough.20l of water weights 20Kg (1Kg per litre), concrete is usually about 2.2-2.4Kg per litre, so bargain on about 45-50Kgs for a 20l jerrycan.